Thought I'd share my current build and see what you guys thought about it. I just came out of a 4 kills 960 dmg match with it. It's a good range build with decent brawling ability, especially with a little luck on the UAC-5. I keep the ML's on chainfire to help minimize the heat. I also use Advanced Zoom when stuck at long range. You can swap out the ERLL's for LL's if worried about heat and drop the AMS for a STD290 if you want a bit more speed. Overall this has been a fun build for me and the heat hasn't been difficult to manage.
I based my build on this, but switched ACs for a little bit more brawly good times. By far the best time I have had playing a Heavy. Thanks for the inspiration OP!
You're welcome! I've since switched to an AC20 build on my CTF-1X. The unreliability of the UAC/5 started to bother me. Was fun for a while, though.